20400231040 has 64 divisors (see below), whose sum is σ = 55736357760. Its totient is φ = 6994363392.

The previous prime is 20400231029. The next prime is 20400231121. The reversal of 20400231040 is 4013200402.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2272332 + ... + 2281291.

It is an arithmetic number, because the mean of its divisors is an integer number (870880590).

Almost surely, 2^20400231040 is an apocalyptic number.

20400231040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400231040 is an abundant number, since it is smaller than the sum of its proper divisors (35336126720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20400231040 is an equidigital number, since it uses as much as digits as its factorization.

20400231040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553649 (or 4553637 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20400231040 its reverse (4013200402), we get a palindrome (24413431442).

The spelling of 20400231040 in words is "twenty billion, four hundred million, two hundred thirty-one thousand, forty".